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JWJ > Volume 29(3); 2011 > Article
Journal of KWJS 2011 June;29(3) :76-81.
Published online July 7, 2011.
A Study of Stress Intensity Factors using Micro Fiber Composite Sensors
Dong-Jin Oh, Myung-Hyun Kim

Correspondence:   Published online July 7, 2011
ABSTRACT
  Recently, the structural failures due to fatigue occur frequently with the increase of size of ships and offshore structures. In this respect, the assessment of fatigue life and the residual strength are very important. Currently, the smart materials technology has demonstrated a variety of possibilities for a diagnosis of structural strength and structural health condition for large structures. The benefits and feature of the MFC sensor are more flexible, durable and reliable than conventional smart material. In this study, Micro Fiber Composite (MFC) sensor for the measurement of stress intensity factor (SIF) of two dimensional cracks induced in a structure is developed. Two MFC sensors are placed in the vicinity of the crack tip close to each other with the crack tip in between them. The SIFs of Mode Ⅰ(K<SUB>Ⅰ</SUB>) as well as of Mode Ⅱ(K<SUB>Ⅱ</SUB>) based on the piezoelectric constitutive law and fracture mechanics are calculated. In this study, the SIF values measured by MFC sensors are compared with the theoretical results and measured value.
Keywords: MFC sensor;Stress intensity factor(SIF);Fatigue crack growth;Piezoelectric
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